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<TITLE> 三、参考点(Datum Point)之用?</TITLE>
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<H2><A NAME=SECTION00713000000000000000> 三、参考点(Datum Point)之用途</A></H2>
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做为安置各参考单元之位置点，或藉以产生各参考单元。
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<I>Jun-Lin Chen <BR>
Wed Mar 22 16:39:25 CST 1995</I>
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